Plant physiology encompasses the study of plant form and function. As plants evolved to life on land they were required to evolve methods to survive with the separation of CO2 and water. Plant physiology looks at the different parts of plants and how they work, either individually or collectively. It includes the study of such topics in plant biology as the structure and function of leaves, stems and roots, water and sugar conductivity, and the reproductive organs of plants.Plant physiology is the study of plant function and behaviour, encompassing all the dynamic processes of growth, metabolism, reproduction, defence, and communication that account for plants. Considering that most of these processes take place at the level of cells, tissues, and organs, there is, because of the close association between structure and function in plants, also a close association between plant physiology and plant anatomy. Moreover, within the living cell, much of the metabolic activity is at the molecular level; therefore, a full understanding of a plant’s physiology requires an essential background in chemistry and physics.